LOS ANGELES — Rafael Devers had three hits in 10 at-bats when the Giants visited the Tampa Bay Rays at the end of the last trip, which was promising, but hardly a definitive sign that he was back to being one of the game’s most dangerous left-handed hitters. But in the middle of that series, there was a subtle signal. Devers fouled a pitch off during one of the losses and then smirked at the pitcher. He is someone who doesn’t let outsiders into his world — even after Monday’s big game at Dodger Stadium, he turned down interview requests — but in that moment, it was clear that he felt more like his old self. A week later, Devers seems fully back. And the Giants are in much better shape because of it. Devers reached base four times Monday in a 9-3 win over the Los Angeles Dodgers and got the scoring started with his third home run in five games. The Giants have won three of four, but are still just 17-24. It’s a lot easier to feel optimistic, though, when you have your best hitters pulling most of the rope, and right now it seems that they’re coming around.  RAFI IS ON FIRE pic.twitter.com/kn7M6IBMwH — SF...